Protection for arch-tubes.



LE GRAND PARiSH.

PROTECTIONFOR ARCH TUBES.

A PLICATION FILED JAN. 8,1916.

Patented J 11116 12, 1917.

l'nvcnzkir arch bricks u on the and every brick w To all whom it may concern:

Be it known that I, Ln GRAND PARISH, a citizen of the United States, and a resident of Mountainview, Passaic county, New J ersey, have invented certain new and useful Improvements in the Protection for Arch- Tubes, of which the following is a specification. Y

My invention relates to improvements in refractory arches or bafles for locomotive boiler'furnaces and has special reference to improvements in the mounting of refractory water-circulating arch tubesof such oilers.

The subject-matter of this application is a .modification of that which is shown and described in my application, Serial No. 71,061, filed January 8, 1916, entitled Locomotive fire box arches.

The material of which arch bricks are made is highly abrasive; so much so, that as the metal arch tubes expand, contract and warp during usage, the coincident move ment of the refractory bricks upon the arch.

tubes wears away the ortions of the tubesupon which the bric s rest. Not infrequently arch tubes are allowed to remain inthe fireboxes until from these causes they are worn so thin as to burst under boiler ressure or collapse arch bricks. Doubtless the danger could be avoided b frequent inspection and replacement of t e tubes; but the difliculty is that the tubes cannot be inspected without removing the arch bricks, and the amount of time and labor needed for that operation is such that it has become the practiceto postpone i tubes until t e time of the removal of the bricks or until some clearly apparent fault in. an arch tube makes the operation necessar The objects of my invention are, to avoid these dangers -to make the frequent inspection of arch tubes unnecessary ;-to avoid the heavy expense of tube replacements due to the arch brick wearg-and to prolong the life of arch tubes.

I accom lish these ob ects by 1 nterposing a relativeil y permanent, but easily removable, wearing strip between each arch tube ich rests upon it. I prefer that the wearing strips shall be compoeedof metal clips clasped upon the arch tubes and furnishing bearings upon which mg strips or clips are under the weight 0 the i ection of the tops of the arch which provide Specification of Letters latent. Patentqgd June 112 11911 '3', 1 Application filed January 8, 1916. Serial No. 71,060. Y

the bricks rest, and whereby the bricks are ralsedout of wearing contact with the tubes. My invention also consists in novel details of construction, whereby the clips are made to perform the additional function of positively holding the bricks upon the tubes until they are more or less intimately united by heat and slag deposits.

y invention will be readily understood on reference to the accompanying drawings that form part of this specification, and in wh1ch:Figure 1 is a vertical longitudinal section of a locomotive firebox containing a front arch embodyin my invention ;Fig. 2 is an enlarged detail of the arch ;-Fig. 3 1s an enlarged cross-section of the arch, on a plane perpendicular to the arch tubes Fig. 4 is a similar view showing bricks of a different type and wearing clips of a modified form ig. 5 illustrates a still further mod1ficat1on;Fig. 6 is a detail plan view illustrating the manner in which the wearplaced to provide three-point bearings for the arch bricks; and, Fig. 7 is a longitudinal section similar to Fig. 2, but showing the clips disposed in another way.

In Fig. l of the drawings, 2 represents the flue sheet of a locomotive boiler furnace or firebox. Typical side sheets, 3, and a typical crown sheet, 4, and a typical rear sheet, 5, are shown. The forwardly and downwardly inclined water-circulating metal arch tubes,

6, may be of any desired number, shape and size. They are usually spaced at equal distances and ordinarily are parallel.

The marginal arch bricks, 7, are supported by the outer tubes, 6, and the side sheets of the firebox. Intermediate arch bricks, 8, close the spaces between the several arch tubes. The Wearing or protecting strips above referred to are placed on the tubes, and the several bricks rest thereon instead of directly upon the tubes. As best shown, in Figs. 3, 4, 5, and 6, the arch bricks are of the sectional type,characterized by socketed ends shaped to fit the arch tubes.

In many instances the intermediate arch bricks will be found in the form shown in Fig. 3, that is, characterized by end sockets inclined ends, 9. In other instances the bricks will be found in the form shown in Fig. 4, having one curved socket, 10, and one inclined end, 11. And

instill other instances the bricks will be -found provided with curved sockets, 12, at

- tional' arch bricks,'whatever the shape of the bearing surface thatthe brick presents to the supporting arch tubes.

In all forms of tube-supported sectional arches, the expansion and contraction, of the firebox side sheets and of the arch tubes causes considerable movement between the arch tubes and the bricks which they support. This movement results in the .ob-

jectionable Wearing" away of the arch tubes at the places where the arch bricks bear upon them. To obviate this difiiculty Iplaceupon the, times, before setting the bricksthereon, a plurality of wearing strips in theform of metal clips which are spaced apart upon 20 respective'tubes and provide bearings for the bricks, in lieu of the arch tubes.

Several of these wear-receiving clips are provided upon each arch tube, their num-' her and arrangement varying with the number and positions of the arch bricks. I make the clips in'several forms. Thus, as shown in Fig. 3, the clip, a, is of substantially circular form, but split or open so that it may be forced into position over the tube. Such 30 clips are also shown in Figs. 1, 2- and 7, in

which it will be seen that the positions of the clips upon the tubes, 6, may be varied as desired according to the kind of bearings best suited to the bricks and tubes with 35 which they are to be used. As indicated in Fig. 2, a single clip, a, in "each case may'provide the bearing or wearing-support for-the abutting sides of two arch bricks in the'same longitudinal row; or, as shown in Fig; 7, the clips may be more numerous to provide each brick-end with two. separate bearings. Frequently the water-tubes are not in exact parallelism and in such cases the bricks may be most securely lodged upon the tubes by limiting them to three points of bearing thereon. My novel wear-preventing strips or clips lend themselves admirably to the accomplishment of this purpose, as shown.

in Fig. 6.

In order that the weight imposed upon the arch tubes shall not be excessive, arch bricks are made as light as consistent with 'the Work to be performed bythem. Thus it happens that when arch bricks are first placed upon the arch tubes and before they are in a measure sealed together by fusion and slag, they are apt to be lifted 0d the tubes by 'the strong suction between the grate and the fines of the firebox. To avoid thi's'difiiculty I shape the wearing clips in such manner that they act as locking devices to temporarily secure or anchor the arch bricks upon the tubes until such'time as they are anchored thereto by the action of the fire. I accomplish this without sacriimam? ficinig the wear-resisting function of the clips. I 7

There are two forms of the clips which best perform the double function of. provid-.

ing bearings for the bricks and also anchoring the bricks. One form is, shown in Fig. 4 and a secondform in Fig. 5. They are from the tubes. The 011 6, shown in Fig.

portion, 1;, formed integrally by" the middle part of the strip of metal composing the clip. The clip, 0, of Fi 5 is characterized by a two-part or divide -T-he'a'd, 0, formed by the outwardly-bent ends of the metal strip. Obviously, both forms of the an- 1 choring clip, when placed in; po'ition between the ends of two bricks, eife tively secure the same to the-supporting t 1 be. The necks or stems, d, of the anchoring strips are thinner or narrower than the normalspaces between theadjacent ends of the bricks and therefore the clips do not prevent endwise movement of the bricks.

The portion of the metal clipiwhich is tightly seated against the outer surface of the water-cooled tube is cooled and proviously, the burning away of the anchor projection does not disturb the wear-resist.

ing bearing portion of the clip in-itsrelation to the tube or the brick.

Anchoring clips of the kind shown in Figs. i and 5 may be distributed in the three-point bearing relation disclosed in Fig. 6, quite as well as can the clips simpler form shown in Fig. 3.

of the alike, in that both have T-shaped heads which. overlap the tops of the brick ends and serve to prevent the lifting of the bricks .4. is-characterized by a 'T-head or anchor Various modifications of my invention will readily suggest themselves to those skilled in the art, and, except as stated in the appended claims, I do not limit my invention to the specific structures. herein shown and described.

Having thus described my invention, I claim as new and desire to secure by Letters Patent 1. A locomotive firebox and contained group of water-circulating.arch tubes, in combination with refractory arch bricks supported by and between said tubes, and metal wearing clips spaced upon said tubes and providing three-point bearings for the bricks.

2'. A locomotive firebox and contained group of water-circulating arch tubes, in

combination with refractory arch bricks supported by and between s'aidtubes, metal esser? wearing clips clasped upon said tubes in spaced relations and providing bearings for said bricks'and thus relieving the tubes from the Wear of the bricks 3. A locomotive firebox and contained group of water circulating arch tubes, in combination with refractory arch bricks supported by and between said tubes, metal wearing clips spaced upon said tubes and providing bearings thereon for said bricks, 10 and said clips being provided with brick ancioring projections upon their tops, which engage the bricks and prevent the lifting thereof from the tubes.

In testimony whereof, I have hereunto set my hand this 28th day of December,

LE GRAND PARISH. 

